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Fig. 13: Slowly Opening Valve On Vacuum Gage Assembly 15. Slowly open the valve on the vacuum gage assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose. 16. Close the valve on the venture assembly. 17. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum and monitor for vacuum loss. If vacuum loss is observed, refer to Loss of Coolant. 18. Open the valve on the vacuum gage assembly. The vacuum gage will drop as coolant is drawn into the system.
2007 Hummer H3 2007 ENGINE Engine Cooling - H3
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